Model plants and their Role in genetic manipulation. Mitesh Shrestha
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1 Model plants and their Role in genetic manipulation Mitesh Shrestha
2 Definition of Model Organism Specific species or organism Extensively studied in research laboratories Advance our understanding of Cellular function Development Disease Ability to apply new knowledge to other organisms
3 Current Models Drosophila Xenopus Zebrafish Mouse C. elegans Yeast E. coli Arabidopsis
4 Arabidopsis thaliana
5 Arabidopsis thaliana Small flowering plant native to Eurasia. Considered a weed Found by roadsides and in disturbed lands. A winter annual with a relatively short life cycle, Popular model organism in plant biology and genetics. Relatively small genome of approximately 125 megabase pairs (Mbp). It was the first plant to have its genome sequenced, and is a popular tool for understanding the molecular biology of many plant traits, including flower development and light sensing. In 2016, it was named as one of the organisms that would be involved in CRISPR-based genetic engineering.
6 Arabidopsis thaliana Dicotyledonous angisoperm The model Plant for Genetic Engineering of Plants Member of Mustard Family Belongs to Brassicaceae Family Discovered by botanist Johannes Thal in the 1500s First mutant reported in 1873 Chromosome number discovered in 1907 by Friedrich Laibach in 1907 Entire genome sequenced in 2000
7 Arabidopsis thaliana Tens of thousands of the plant can be grown at a time Commonly known as mouse ear cress Grows luxuriantly in temperate regions of the world More than 750 natural varieties seen around the world
8 Arabidopsis thaliana
9 Arabidopsis thaliana A single Plant produces around 6,000 seeds /germination- massive production This enables geneticists to screen large population of seedlings for specific phenotypes Because it has very short life cycle; takes only six weeks from germination to mature seeds Easy to grow- even in small spaces or indoor areas Only requires water, soil and light to reach maturity Also found to be capable of growing in hydroponic system
10 Arabidopsis thaliana Generally self-fertilizes, but selective breeding is possible by fertilizing flowers with pollen from another plant Can be easily transformed with Agrobacterium or any standard chemical mutagens Although closely related to such economically important crop plants as turnip, cabbage, broccoli and canola not a economically important plant Lay the groundwork for studying the biology of all other plant species.
11 Genome of Arabidopsis thaliana First Plant genome to be sequenced, sequencing completed in 2000 by an organsation international collaboration Arabidopsis Genome Initiave (AGI) - started in 1996 and now readily available to the scientific community Nuclear DNA of Arabidopsis carried by five pairs of small chromosomes with well defined banding patterns Contains about 125 megabase sequences Encode approximately 25,500 genes Arabidopsis has many gene families common to plants and animals which have been greatly expanded in plants for instance, Arabidopsis contains 10- fold as many aquaporin (water channel) proteins than any other sequenced organism
12 Arabidopsis Genome 5 chromosomes; 25,498 genes, and 125 million bases Smallest genome of any plant First complete genome sequence of a plant Useful plant-specific gene functions for crop enhancement Grow crops in salty or metallic soils or in very cold or hot climates
13 Arabidopsis Genome
14 Sequence Sequenced by Arabidopsis Genome Initiative (AGI) Started in 1996, planned to finish by 2004, but actually finished in 2000 Current and future research done by The Arabidopsis Information Resource (TAIR) 8,811 articles on Arabidopsis
15 Arabidopsis Genome Initiative (AGI) comprises six main groups The Institute of Genomic Research (TIGR) SPP Consortium (Stanford University, Plant Gene Expression Center, and University of Pennsylvania) The CSHL Consortium (Cold Spring Harbor Laboratory, Washington University at St. Louis and Applied Biosystems, Inc.) The European Union s European Scientist Sequencing Arabidopsis (ESSA) network of laboratories The Centre National de Sequencage (CNS), Frances Kazusa DNA Research Institute, (Japan)
16 Features of Arabidopsis genome Each chromosome contains a limited amount of repetitive DNA Unlike the genes of other plants, the Arabidopsis genes are more tightly packed and contain only small introns- much higher percentage of the genome is associated with coding and genetic function
17 Many crop species have large genomes often as a result of polyploidization events and accumulation of non-coding sequences during their evolution. Maize has a genome of approximately 2400 Megabase pairs (Mbp) around 19 times the size of the Arabidopsis genome with probably no more than double the number of genes, most of which occur in duplicate within the genome. The wheat genome is Mbp 128 times larger than Arabidopsis and 5 times larger than Homo sapiens and it has three copies of many of its genes. The large crop genomes pose challenges to the researcher, including difficulty in sequencing as well as in isolation and cloning of mutant loci.
18 Evidence from the rice genome project suggests that the Arabidopsis genome may be missing some homologs of genes present in the rice genome. Despite this, most of the difference in gene number between Arabidopsis and crop species appears to result from polyploidy of crop species genomes, rather than from large classes of genes present in crop species that are not present in Arabidopsis. Therefore, the genes present in Arabidopsis represent a reasonable model for the plant kingdom. However, it is clear that Arabidopsis represents a starting point rather than the finish line for utilizing the full power of genomics for crop improvement.
19 Significance of Arabidopsis in Plant Genetics Basic life processes similar to those of more complex crop plants such as corn, soybean, and wheat It can be assumed that the basic set of genes that control these processes are the same, making findings applicable to other species Focus of intense genetic, biochemical and physiological study Relatively small, genetically tractable genome that can be manipulated through genetic engineering more easily and rapidly
20 What makes Arabidopsis thaliana a model organism?? Small (20 cm),unremarkable spindly weed, with tiny, white, fourpetalled flowers Rapid growth (takes 48 days from germination to mature seed development- Many offsprings) Small nuclear genome and therefore relative genetic simplicity Convenience and abundance Susceptibility to T-DNA insertions Basic similarities to other crops A large number of mutant lines and genomic resources
21 Convenience Easy to grow Small plant size means tens of thousands can be grown at a time 6-8 weeks from seeds to seeds Massive seed production (potential up to 10,000 seeds per plant) Ability of Arabidopsis thaliana to self-fertilize
22 Easy to Grow Arabidopsis can be grown in small spaces or indoors. They only require water, soil, and light to reach maturity.
23 Short Life Cycle 48 days from germination to mature seed development.
24 Making Knockout Plants Easily susceptible to Agrobacterium which contain Ti plasmids, the vehicles for T-DNA insertion Easy to establish many knockout lines in short amount of time
25 Significance of Arabidopsis in Plant Genetics Basic life processes similar to those of more complex crop plants such as corn, soybean, and wheat It can be assumed that the basic set of genes that control these processes are the same, making findings applicable to other species
26 Disadvantages of Arabidopsis Since the genotypes are so similar, it is hard to distinguish the phenotypes unrecognizable mutations Pests are attracted to these plants Agar can get very contaminated by Fungi
27 Assignment What are the desired characteristics of a model organism? [3] Give brief description about the plant Model Organism.[3] What are the advantages of having Arabidopsis as a model organism? [3] What are the disadvantages of having Arabidopsis as a model organism? [3]
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